Greenhouse wastewater treatment by baffled subsurface-flow constructed wetlands supplemented with flower straws as carbon source in different modes
Greenhouse wastewater treatment by baffled subsurface-flow constructed wetlands supplemented with flower straws as carbon source in different modes
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不同模式下以花草为碳源的折流潜流人工湿地处理温室废水
DOI：
10.1007/s11356-016-7922-4
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发表时间：
2016
影响因子：
5.8
通讯作者：
Wang Xiaoyun
中科院分区：
文献类型：
--
作者：
Chang Junjun;Ma Luyao;Chen Jinquan;Lu Yifeng;Wang Xiaoyun
建立了4个实验室规模的折流板潜流人工湿地（BSCW）系统，对高浓度硝酸盐和硫酸盐的温室废水进行处理。每个BSCW微观世界涉及一个处理区和另一个后处理区，表面积比为2：1。将香石竹和玫瑰（w/w：1/1）的混合秸秆作为有机碳源，通过水解区（CW 1）、分散垂直安装的穿孔管（CW 2）和集中管（CW 3）（空白系统除外）补充到处理区。研究了BSCW系统中氮、硫酸盐的去除、转化及碳的释放情况，并进行了对比评价。结果表明，花卉秸秆的添加能显著提高系统对硝酸盐和硫酸盐的去除效果，在运行初期（30 d），系统对硝酸盐和硫酸盐的去除效果较好，之后由于有机碳供应不足，系统对硝酸盐和硫酸盐的去除效果下降。硝酸盐的去除效率显着更高，更稳定相比，硫酸盐。CW 3对硝酸盐和硫酸盐的去除率最高，平均值分别为4.33 g NO3−-N·m−2d− 1和2.74 g SO 42 −-S·m−2d−1，尽管实验微生态系统之间的差异在统计学上并不显著。但由于秸秆中NO2--N和NH 4 +-N的产生以及有机氮的淋溶，两种工艺对TN的去除率基本相同（3.40-3.47 g N·m−2d−1）。秸秆中有机碳和有色物质在运行初期10 d内有较高的溶出量，运行30 d后迅速下降至较低水平，几乎无法测定。后处理区可以进一步去除各种污染物，但能力有限。无机碳（IC）浓度被检测到是一个非常好的指标，用于估计硝酸盐和硫酸盐的BSCW的去除效率，特别是硝酸盐。
Four laboratory-scale baffled subsurface-flow constructed wetlands (BSCWs) were established for the treatment of greenhouse wastewater containing high levels of nitrate and sulfate in the present study. Each BSCW microcosm involved a treatment zone and another post-treatment zone with a surface area ratio of 2:1. Evenly mixed straws of carnation and rose (w/w: 1/1), two common ornamental flowers, were supplemented as an organic carbon source into the treatment zone through a hydrolysis zone (CW 1), decentralized vertically installed perforated pipes (CW 2), and centralized pipes (CW 3 in the figures), except the blank system. Removals and transformations of nitrogen and sulfate as well as carbon release in the BSCWs were investigated and comparatively assessed. Results showed that the supplements of flower straws could greatly enhance both the nitrate and sulfate removals, and good performance was achieved during the beginning operation period of 30 days, followed by decline due to insufficient organic carbon supply. Nitrate removal efficiency was significantly higher and more stable compared to sulfate. The highest removal rates of nitrate and sulfate were achieved in the CW 3, with a mean value of 4.33 g NO3−-N·m−2d−1and 2.74 g SO42−-S·m−2d−1, respectively, although the differences among the experimental microcosms were not statistically significant. However, almost the same TN removal rate (3.40–3.47 g N·m−2d−1) was obtained due to the productions of NO2−-N and NH4+-N and leaching of organic N from the straws. High contents of organic carbon and colored substance were leached from the straws during the initial 10 days, but dropped rapidly to low levels, and could hardly determined after 30 days operation. The post-treatment zone could further eliminate various contaminants, but the capability was limited. Inorganic carbon (IC) concentration was detected to be a highly good indicator for the estimation of nitrate and sulfate removal efficiencies of the BSCWs, particularly for nitrate.
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